I posted a question on this on the Hide and got no response so Ill try it here as well.

What I am interested in learning about is the adjustable but pad. Now I own 3 rifles that have but pads that can go up, down, left right etc. What exactly am I trying to accomplish with these adjustments besides comfort? Will a certain angle seem to lay against the shoulder better? Am I trying to adjust out some of the muzzle jump?

I can find absolutely ZERO information on setting up an adjustable but pad other than videos showing how one is more adjustable than another!!